Honda CIVIC SEDAN 2018 Owner's Manual page 586

uuIf a Tire Goes FlatuTemporarily Repairing a Flat Tire
Tire Repair Kit
584
*
1. Open the trunk floor lid.
2. Take the kit out of the case.
3. Place the kit face up, on flat ground near
the flat tire, and away from traffic. Do not
place the kit on its side.